Colorado 811 Share: Non-Profit Association/Organization Colorado 811 Visit Website 16361 Table Mountain Parkway Golden, CO 80403 (303) 513-7616 LinkedIn Facebook About Map About CO811 is the communication link between the utility/facility owners and excavators and homeowners. Our goal is to work with all industry stakeholders to protect underground facilities from damages. What's Nearby? Distance: 5 10 15 20 25 50 mi.